快速fft算法的实现，增加了从文件读入的功能-Fast fft algorithm, increase the ability to read from the file into the

其中的函数FFT用于计算一组数据的快速傅里叶变换，输入参数为一个数组，元素个数为2的n次方。程序包含FFT排序算法和蝶形运算。-Function which Fast Fourier Transform FFT calculation for a set of data, the input parameters for an array of n number of elements in a power of 2. Program includes sorting algorithms an

大学时代写的傅里叶变换算法，可作为学习参考之用-The Fourier transform algorithm of the university age can be used as the reference for learning